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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >SCoBi-Veg: A Generalized Bistatic Scattering Model of Reflectometry From Vegetation for Signals of Opportunity Applications
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SCoBi-Veg: A Generalized Bistatic Scattering Model of Reflectometry From Vegetation for Signals of Opportunity Applications

机译：SCoBi-Veg：来自机会信号应用的植被反射的广义双基地散射模型

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摘要

SCoBi-Veg stands for Signals of opportunity Coherent Bistatic scattering model for Vegetated terrains. It simulates polarimetric reflectometry of vegetation canopy over a flat ground using a Monte Carlo scheme. The model is aimed at assessing the value of navigation and communication satellite Signals of Opportunity in a range of frequencies from P-to S-bands for remote sensing of a number of geophysical land parameters such as soil moisture and biomass. A fully polarimetric expression for bistatic scattering from a vegetation canopy is first formulated for a general case and is then specialized to the practical case of ground-based/low-altitude platforms with passive receivers overlooking vegetation using the signals transmitted from large distances. Using analytical wave theory in conjunction with distorted Born approximation, the transmit and receive antenna effects (i.e., polarization crosstalk/mismatch, orientation, and altitude) are explicitly accounted for. The forward model developed here enables the understanding of the effect of different geophysical parameters and system configurations on the coherent and incoherent components of the reflected signatures. It can thus help developing robust inverse algorithm for extraction of soil moisture and biomass. The model is applied to P-band signals of geostationary communication satellites to describe polarimetric reflections from tree canopies as observed from down-looking platforms at various altitudes. The relative contributions of diffuse and specular scattering on total reflected power and reflectivity are quantified for various observing scenarios.
机译：SCoBi-Veg代表植被地形的机会信号相干双基地散射模型。它使用蒙特卡洛方案在平坦地面上模拟植被冠层的偏振反射法。该模型旨在评估从P到S波段的频率范围内的导航和通信卫星机会信号的价值，以遥感许多地球物理土地参数，例如土壤湿度和生物量。首先针对一般情况制定从植被冠层进行双基地散射的全极化表达式，然后将其专门用于基于地面/低空平台的实际情况，其中被动接收器使用从远距离传输的信号俯瞰植被。使用分析波理论结合失真的Born近似，可以明确考虑发射和接收天线的影响（即极化串扰/不匹配，方向和高度）。此处开发的前向模型使您能够了解不同地球物理参数和系统配置对反射签名的相干和不相干分量的影响。因此，它可以帮助开发鲁棒的逆算法来提取土壤水分和生物量。该模型应用于对地静止通信卫星的P波段信号，以描述从各种高度的俯视平台观察到的树冠的偏振反射。对于各种观察情形，量化了漫反射和镜面散射对总反射功率和反射率的相对贡献。

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